The agency has registered a case into the police firing at Adhikaripara and Gokulnagar in Nandigram on March 14 and the arrest of 10 Communist Party of India-Marxist supporters from the Janani brick kiln on March 17 there.

The Calcutta high court on November 16 had directed that the CBI to continue probe into the police firing and asked the agency to submit a report within a month.